Fabric-testing machine



r A. E. JURY. FABRIC TESTING MACHINE.

APPLICATION FILED JULY 24,1918.

Patented 'Jan. 6, 1920.

2 SHEETS-SHEET 1- A. E. JURY.

FABRIC TESTING MACHINE. APPLICATION FILED JULY 24.1918.

1,327,393.. Patented Jan. 6,1920.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

ALFRED E. JURY, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE UNITED ST .LTES TIRE COMPANY, A CORPORATION OF NEW YORK.

FABRIC-TESTING MACHINE.

Specification of Letters Patent.

Patented Jan. 6, 1920.

To all whom it may concern:

Be it known that I,'Ar.rnno E. JURY, a citizen of the United States, residin at Newark, county of Essex, State of eW Jersey, have invented certain new and useful Improvements in Fabric-Testing Machines, of which the following is a full,

clear, and exact description.

This invention relates to fabric testing machines and has for its object the provision of means for recording by a curve on a chart both the stretch and the strength of the fabric, the curve showing the strain upon the fabric at each point of stretch.

The improvements will be understood by reference to the accompanying drawings, in which:

Figure 1 is a side elevation of a machine embodying the improvement;

Fig. 2 is an isometric perspective view of certain parts of the recording mechanism.

The machine comprises a frame comprising the uprights A and cross pieces B, trackway C being located above the latter for two clamp carriages D, D. Each clamp carriage supports a pair of clamping jaws E, E for a section F of the fabric to be tested. It will be seen that the clamp jaw E in each case is pivoted at' 1 upon the lower clamp jaw E and may be moved into clamping engagement with its companion jaw by means of an adjusting screw 2. Carriage D is connected with a worm 3 driven in any suitable manner from a shaft 4, and the latter may be driven by power or by means of a hand wheel 5. Assuming the two sets of clamp jaws to hold a piece of fabric between them, rotation of shaft i will move clamp. carriage D to the right and, through the piece of fabric, impart a corresponding movement to the clamp carriage D The free movement of clamp carriage D, however, is resisted by the following means:

Suitably pivoted at 6 on the frame of the machine is a weighted pendant arm 7, to which arm is rigidly connected a sprocket wheel 8 over which is led a chain 9 connected with carriage D. Thus when the rotation of shaft 4: and the movement of carriage D to the right acts through the fabric piece F upon carriage D, the latter is compelled to rotate shaft 6 and swlng the arm 7. Inasmuch as the arm 7 moves weight 10 toward the horizontal, the strain upon the fabric becomes gradually increased as carriage D moves to the right, until the fabric reaches the breaking point. 1 When the fabric breaks, the return movement of weighted arm 7 is prevented by means of a pawl 11 which engages the teeth l2 of a ratchet bar 12. The pawl 11 may be raised toenable the return of the arm 7 to initial position by means of a yieldingly supported segment bar 13 depressed throu h a member 14 to engage a roller 15 carried y the pawl.

The strain exerted upon the fabric piece F by the movement of swinging arm 7 toward the horizontal-is recordedona chart G by the following means:

Rigidly mounted upon the frame of the machine are two vertical rods H, H, each .supporting a block 16. To the blocks 16 is secured the longitudinally extending plate 17 .of a frame I; and slidably mounted between the parallel frame members 18 is arranged the chart frame G for chart G. It will be understood that the chart G may be of paper or similar material removably secured to the chart frame by any suitable means. The chart frame may be provided with rollers 34 to run on the upper frame member 18 as a trackway. A pointer 19 may be placed on the chart frame to register with a marking onthe chart so that the latter may be accurately placed in the frame.

The rods are maintained in parallelrelationship by means of triangular spacing members K, each member being provided with an apertured boss 20 to guide aslide rod .21 which pivotally supports a marking instrument 22 in contact with the chart. The slide rod '21 is counterbalanced by weight 23 secured to one end of a cord 24, the cordbeing led over a guide roller 25 on an arm 26 supported on vertical rod H and thence to an eyelet screw 27 on the slide rod.

The weighted arm 7 is provided with a segment rack 28 above its pivotal point 6, the rack being in mesh with a 'inion 29 to which is secured a periphera lygrooved cam-like member 30.- Secured in the groove of the cam-like member 30 is one end of a cord 31 which is led over a guide roller 32 The chart is moved to record the stretch of the fabric by the following lnstrumentallties:

Projecting upwardly from clamp carriage D is an arm 35, a like arm 36 be ng earned by clamp carriage D. Arm 35 is provided with a guide roller 35 and arm 36 is provided with guide rollers 36*. A cord 37 weighted at 38 is led over one of the guide rollers 36 and connected at 39 to the chart frame G. This weight prevents extra movement or over-displacement of the frame G to the ri ht when the specimen is elongated and tiereby insures recording of the elongation in exact proportion to the actual distention of the specimen. A second cord 40 is connected to the chart frame at 41, is led over guide roller *,and thence extends to and over the other guide roller 36 and finally is connected at 42 to the fixed frame I. From this construction it will be seen that the separation of the clam car riages, in accordance with'the stretching of the fabric, will move the chart frame to the right from its position in Fig. 2 and cause the marker to indicate such movement on the chart. the gradually increasin strain to which the fabric is subjected wilfbe recorded on the chart by the gradual elevation of the marker, the combined movements of the latter producing a curved line on the chart.

With the construction and arrangement disclosed by the applicant it is possible to use a chart G having regularly spaced and preferably parallel ordinates and abscissas. This is a feature of no inconsiderable value in this type of testing machine, because it enables diagrams or curves plotted to be read with the utmost ease. It is to be noted in this connection that the frame carrying the chart is connected directly to bothjaws holding the specimen, and that the connections are arranged preferably, but not necessarily, to move t e frame a distance exactly twice the strainor elongation of the specimen.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

' 1. In a fabric testing machine, two clamping devices adapted to hold a piece of fabric between them, means for relatively moving said devices, a movable chart and a marker in register therewith, a guide roller carried by each clamping device, and a cord looped about each guide roller, one end of the cord being connected to the chart and the other end being connected to a fixed member.

2. In a fabric testing machine, two movable clamps adapted to hold a piece of fabric between them, a chart and a reciprocable marker in register therewith, means for positively moving one of said clamps, means for resisting the movement of the second And simultaneously therewith clamp including an actuated member, and 'a cord operatively connecting said actuated member and the marker.

3. In a fabric testing machine, two clamps adapted to hold a piece of fabric between them, a movable chart and a reciprocable marker in register therewith, a guide roller carried by each clamp, a cord looped about each guide roller, one end of the cord being connected to the chart and the other end being connectedto a fixed member, means for posltively movmg one clamp, means for resisting the movement of the second clamp including an actuated member, and a cord operatively connecting said actuated member and the marker.

4. In a tensile testing machine, in combination, alined shiftable clamps for holding to apply stress, said last mentioned means including a suspended weight arranged to move from a more or less vertical'position to a position more nearly horizontal in order to gradually apply tension to the specimen, and means operatively connected with said weight and with said clamps for simultaneously indicating corresponding stresses and elongations.

5. In 'a tensile testing machine, in combination, alined shiftable jaws for holding the opposite ends of a specimen, means for movingv one of said jaws, means positively connected to the other jaw and actuated by movement thereof through the specimen gripped by the first mentioned jaw to apply stress to the specimen, and means for indicating the applied stress including a chart located intermediate the jaws and a rectilinearly movable marker for graphically recording the applied stress on the chart.

6. In a tensile testing machine, in combination shifta ble jaws for gripping a specimen, means for positively moving one jaw and through the specimen also moving the other jaw, means for resisting the movement of the other jaw and applying tension to the specimen, a graphic recording device comprising a chart and a marker, connections between said tension applying means and one part of said graphic recording device for moving the latter in fixedand definite proportion to the former, and connections between said jaws and the other part of the graphic recording device for moving the latter, whereby a curve may be made on a chart whose abscissas or ordinates may either be spaced at regular intervals.

7. In a tensile testing machine, in combination, shiftable jaws for gripping a specimen, means for positively moving one jaw and through the specimen also moving the other jaws, means for resisting the movement of the other jaw and applying tension to the specimen, a graphic recording device comprising a chart and a marker, connections between the two mentioned parts of the graphic recording device and the tension applying means and the jaws for plotting the stresses and strains, said connections being adapted to move the parts of the graphic recording device in fixed and definite proportion to the stresses and elongations of the specimen, whereby the chart employed may be provided with regularly spaced abscissas and ordinates for convenience in reading a curve described thereon.

8. In a tensile testing machine, in combination, shiftable jaws for gripping a specimen, means for positively moving one of said jaws, means resisting movement of the other jaw and applying tension to a specimen held by the jaws, a graphic recording device including a chart and a marker,

' between the parts of said and connectlons graphic recording device and the jaws and the connections betension applying means, tween the tension applying means and a part of the graphic recording device including a weighted arcuately removable arm, and a grooved cam actuated by the weighted arm.

Signed at Newark, N. J this 19th day of July, 1918.

, ALFRED E. JURY. 

